I've wanted this board for a while, and I'm looking to order it next week. YMI has not disappointed me to date, but I was hoping someone might be able give me a review.
I bought a similar board in Tokyo a couple of years ago. Provided the "spikes" fit properly into the holes (mine had to be sandpapered down to fit), the result is a very useful board, which avoids the drawback of folding boards. Thus, the board remains a solid surface during the time it is constructed and also avoids the annoying division line at the middle of folding boards.
So it looks like a good board to have.
I have this board. I bought it about a year ago. Since then, I've used it as my portable/traveling board and have been very happy with it.
The board has a nice surface and seems to be a quality product.
The peg system works quite well and the two pieces of the board fit together snugly. When assembled, you have to inspect the board quite closely to see that it is made out of two pieces.
The carrying case is also fine. It includes foam to protect the board in transit. I've taken the board on a number of trips and had no problems. The only drawback to the case in my opinion is that it doesn't have any room for carrying stones. So you have to carry the stones separately (I just put them in my suitcase).
One point is that the board is about 16.75 inches times 18 inches, and is a little small for my large single convex yunzi stones if I place a bunch of them together. However, my regular biconvex Japanese stones work just fine.
Overall, I consider the board to be well worth the price.